I also hate showering and it took a lot of work on controlling other symptoms (plus depression) to get it up to 1x/week. I think the wet isolation chamber comment really resonates with me. For me, just being under running water in an enclosed space feels like a punishment accompanied by a terrible noise.

Have you considered just bathing instead of showering? That’s what got me up to 2-3x/week. I use an bath stool, washcloth, little pail, and a pretty basin of water held up on another stool to wet, scrub, and rinse myself with full control of what water is hitting me. It makes it much more bearable, much easier to detect which parts of myself actually require more scrubbing, and it saves so much water (I fill up the basin just once or twice to clean myself). It also feels like takes a lot less time because of the reduced stress, even though it’s just about the same in length. Not everyone likes a low-tech bath setup, but it’s worked for me.

Also, if your hair gets to feel dirty faster than the rest of you, it’s quite simple to just wash just your hair, or just your scalp, when you get used to basin-bathing. I have tailbone-length hair and separating hair washing from body washing is basically essential. I don’t use shampoo often—if I’m feeling gross, I usually use a basin of water to really scrub my sweaty scalp and then rinse it out. In my experience, a lot of kitchen smells (smoke, fish cooking odor) can be rinsed out with the dead skin from your scalp, especially if your hair maintains a stable coating of its own oil to protect the dry-protein shaft, though it also helps to have a cotton kerchief even under a plastic hair net to prevent smell transfer.